Diagnostic code
346 — Headache (e.g Migraine, cluster, tension, etc.)
346 is an OHIP diagnostic code used on Ontario Health Insurance Plan claims. Headache (e.g Migraine, cluster, tension, etc.).
- Code
- 346
- Description
- Headache (e.g Migraine, cluster, tension, etc.)
Updated October 26, 2026
346 is the OHIP diagnostic code for headache disorders such as migraine, cluster headache and tension headache.
Conditions billed under this code
- Migraine
- Headache
What it covers
The Ministry lists 346 as 'Headache (e.g Migraine, cluster, tension, etc.)' in the Nervous System and Sense Organs chapter. The wording was updated in March 2026 (INFOBulletin 260314).
Use it for migraine, tension-type headache, cluster headache and other headache disorders.
780 is for a headache not yet diagnosed; its wording leaves out tension headache and migraine, which belong here. Close neighbours: 350 trigeminal neuralgia, 850 concussion, 854 other head injuries.
Related codes: 780, 350, 850, 854
Sources
- OHIP Diagnostic Codes (Ministry of Health, February 2026)
- INFOBulletin 260314: New diagnostic codes and updated descriptions (March 2026)
APEX flags claims whose diagnostic code does not fit the service billed before they come back rejected. See how APEX works · Pricing